BR9915115A - Procedure for ask demodulation and demodulator-ask - Google Patents

Procedure for ask demodulation and demodulator-ask

Info

Publication number
BR9915115A
BR9915115A BR9915115-4A BR9915115A BR9915115A BR 9915115 A BR9915115 A BR 9915115A BR 9915115 A BR9915115 A BR 9915115A BR 9915115 A BR9915115 A BR 9915115A
Authority
BR
Brazil
Prior art keywords
voltage
ask
mean value
level
voltage level
Prior art date
Application number
BR9915115-4A
Other languages
Portuguese (pt)
Inventor
Gerhard Nebel
Volker Guengerich
Andreas Blum
Uwe Weder
Dierk Eichner
Robert Reiner
Gerhard Schraud
Original Assignee
Infineon Technologies Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Infineon Technologies Ag filed Critical Infineon Technologies Ag
Publication of BR9915115A publication Critical patent/BR9915115A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/062—Setting decision thresholds using feedforward techniques only

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

A method for demodulating a voltage which has been ASK modulated by changing the amplitude between a low level and a high level, in particular for use during contactless data transmission from a card reader/writer to a smart card, is described. The method is distinguished, in that, in an initialization phase, a first mean value is produced from the high voltage level and a stored partial voltage derived therefrom in order to detect a change to a low voltage level. The change to the low voltage level represents a start value and is detected by a subsequent comparison of the modulated voltage with the first mean value. In a subsequent demodulation phase, a second mean value is produced from the detected low voltage level and the high voltage level in order to demodulate the modulated voltage by comparing the modulated voltage with the second mean value.
BR9915115-4A 1998-11-05 1999-11-03 Procedure for ask demodulation and demodulator-ask BR9915115A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98120985 1998-11-05
PCT/EP1999/008430 WO2000028708A1 (en) 1998-11-05 1999-11-03 Method for ask demodulation and ask demodulator

Publications (1)

Publication Number Publication Date
BR9915115A true BR9915115A (en) 2001-07-31

Family

ID=8232919

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9915115-4A BR9915115A (en) 1998-11-05 1999-11-03 Procedure for ask demodulation and demodulator-ask

Country Status (12)

Country Link
US (1) US6307428B1 (en)
EP (1) EP1125407B1 (en)
JP (1) JP3553502B2 (en)
KR (1) KR100411562B1 (en)
CN (1) CN1147099C (en)
AT (1) ATE259128T1 (en)
BR (1) BR9915115A (en)
DE (1) DE59908482D1 (en)
ES (1) ES2216588T3 (en)
RU (1) RU2213425C2 (en)
UA (1) UA54622C2 (en)
WO (1) WO2000028708A1 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50013689D1 (en) * 2000-03-24 2006-12-14 Infineon Technologies Ag decoding
DE10116747B4 (en) * 2001-04-04 2006-01-26 Infineon Technologies Ag Circuit arrangement for demodulating a voltage modulated by changing the amplitude between a low and a high level (ASK-)
EP1374514B1 (en) * 2001-04-04 2010-03-31 Infineon Technologies AG Demodulator for amplitude shift key (ask)-modulated signals
US7545892B2 (en) 2002-08-22 2009-06-09 Infineon Technologies Ag Method and circuit for controlling the input signal for a contactless transponder
DE10251459B4 (en) * 2002-08-22 2005-06-09 Infineon Technologies Ag Method for controlling the input signal of a contactless transponder
DE10248223B4 (en) * 2002-10-16 2006-03-23 Infineon Technologies Ag Transceiver unit for data transmission by means of amplitude modulation / demodulation
WO2007063584A1 (en) 2005-11-30 2007-06-07 Fujitsu Limited Demodulator circuit
CN100499617C (en) * 2006-01-20 2009-06-10 清华大学 Comparison and decision circuit in amplitude keying signal demodulation circuit module
JP4982260B2 (en) * 2006-06-20 2012-07-25 パナソニック株式会社 Pulse modulation circuit
US7609783B2 (en) * 2006-08-15 2009-10-27 National Central University Amplitude shift keying (ASK) demodulation circuit based on a self sample as a basis application in an organism implantation microsystem
US7971794B2 (en) * 2008-02-07 2011-07-05 Infineon Technologies Ag Actively regulated modulation index for contactless IC devices
KR100990129B1 (en) * 2010-04-30 2010-10-29 주식회사 에세텔 Low powered amplitude shift keying demodulator
CN103209150B (en) * 2012-01-16 2016-01-27 博通集成电路（上海）有限公司 The demodulation method of amplitude shift keying demodulator and amplitude shift keying signal
US10396857B2 (en) * 2013-04-15 2019-08-27 Infineon Technologies Ag Data transmission
KR102068954B1 (en) 2014-03-04 2020-01-22 삼성전자 주식회사 Amplitude Shift Keying Demodulator and Communication Apparatus including the same
DE102014108871A1 (en) * 2014-06-25 2015-12-31 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Electronic circuit, field device comprising at least one such electronic circuit and method
CN106300576B (en) 2015-05-11 2021-04-20 恩智浦美国有限公司 Bidirectional communication demodulation method for wireless charging system
CN114745241B (en) * 2022-05-06 2023-08-11 浙江地芯引力科技有限公司 Amplitude modulation signal demodulation device and power supply equipment

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3540170A1 (en) * 1985-11-13 1987-05-21 Turbo Werk Messtechnik Gmbh CIRCUIT FOR CONVERTING A PERIODIC USE SIGNAL TO A DC VOLTAGE SIGNAL
DE4001411A1 (en) * 1990-01-19 1991-07-25 Bosch Gmbh Robert Average value signal generating circuitry - processes NRZ signal to recover information of digital input signal subjected to DC coding
EP0525642B1 (en) * 1991-07-23 1999-10-06 Hitachi Maxell Ltd. A recording medium reader/writer system and a non-contact IC-card system
DE19703967C2 (en) * 1996-10-10 1998-09-24 Lg Semicon Co Ltd Amplitude shift keying receiver

Also Published As

Publication number Publication date
EP1125407B1 (en) 2004-02-04
UA54622C2 (en) 2003-03-17
ES2216588T3 (en) 2004-10-16
CN1147099C (en) 2004-04-21
US6307428B1 (en) 2001-10-23
DE59908482D1 (en) 2004-03-11
CN1325581A (en) 2001-12-05
US20010033197A1 (en) 2001-10-25
KR20010083951A (en) 2001-09-03
RU2213425C2 (en) 2003-09-27
EP1125407A1 (en) 2001-08-22
JP3553502B2 (en) 2004-08-11
KR100411562B1 (en) 2003-12-18
WO2000028708A1 (en) 2000-05-18
JP2002530012A (en) 2002-09-10
ATE259128T1 (en) 2004-02-15

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Legal Events

Date Code Title Description
B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 6A E 7A ANUIDADES.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 1913 DE 04/09/2007.